Chimera refusing to enter InstantMenu on Fusion Drive

[Fjordn]

I literally just finished with my DIY Fusion Drive project on a Hack that's been working for over a year, and the most apparent problem is with Chimera:
It will not enter the instant menu and instead boots into OS X after a short timer.
I can still enter the menu by hitting any key, but I'd rather not have to every single time I restart my computer (which I do often as all my games are on my Windows side).

As seen in the attached screenshot, I have run MultiBeast and selected the InstantMenu option, only to have Chimera consistently ignore my efforts. I'm not sure what the problem is; I have tried:
-Reinstalling Chimera
-re-running Multibeast, both before and after re-installing Chimera
-changing the boot device to the other half of the Fusion Drive in BIOS
-resetting NVRAM with "sudo nvram -d boot-args"

Any help would be fantastic.

 

[Fjordn]

I believe I have figured out the problem on my own.
Chimera was reading the /Extras folder from one of the two Fusion Drive's "Boot OS X" partition, so I mounted them via

diskutil mount disk0s3

and

diskutil mount disk1s3

then manually changed the .plist file to reflect the earlier screenshot.

That was a head-scratcher, make no mistake.